Apple makes their money from hardware -- software sales are just icing on the cake. Sony, however, has to take piracy threats (since even well-intentioned cracking will lead to piracy) very seriously because they make all of their money from software sales.
Sony's ineffectual attempts to lock down the PSP (starting with the last-minute homebrew policy reversal) probably contributed to the firmware hacking community's fervor. However, after the rampant piracy on the PSP platform, I think Sony is going to take any firmware hacks very seriously. Gamers have proven to be perfectly willing to pirate games if given the opportunity.
I remember when Nintendo said that. You'll note that the spinny disc camp slaughtered them. Spinny discs are little sheets of polycarbonate. They're ridiculously cheap to make.
Sony's ineffectual attempts to lock down the PSP (starting with the last-minute homebrew policy reversal) probably contributed to the firmware hacking community's fervor. However, after the rampant piracy on the PSP platform, I think Sony is going to take any firmware hacks very seriously. Gamers have proven to be perfectly willing to pirate games if given the opportunity.